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US3342424A
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US
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Titanium dioxide pigment and preparation
Assignee: Wyeth Holdings LLC
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Filing: 1965-08-25
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Granted: 1967-09-19
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Expires: 1985-08-25
Abstract
No abstract record available.
Inventors
- 👤 Walter R Whately
- 👤 Jr George L Roberts
- 👤 Gerard M Sheehan
- 👤 Jr William S Castor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:06
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3615; C09C1/3623; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD OF IMPARTING BOTH A BLUER TINT TONE AND INCREASED TINTING STRENGTH TO A PARTICULATE TITANIUM DIOXIDE PIGMENT MIXTURE WHEREIN THE ULTIMATE PARTICLES ARE LESS THAN 0.4 MICRON IN DIAMETER BUT WHICH CONTAINS SUBSTANTIAL AMOUNTS OF OVERSIZE AGGREGATES IN THE SIZE RANGE OF FROM 0.4 TO 4 MICRONS AND IS SUBSTANTIALLY FREE FROM PARTICLES LARGER THAN ABOUT 4 MICRONS WHICH COMPRISES PREPARING A SLURRY IN AN INERT LIQUID OF SAID PIGMENT MIXTURE TOGETHER WITH ABOUT 2 TO 20 TIMES ITS WEIGHT OF INERT GRINDING PARTICLES HAVING AN AVERAGE SIZE OF ABOUT 10 TO 40 MESH, SUBJECTING THE SLURRY TO MECHANICAL AGITATION AND THEREBY CAUSING THE GRINDING PARTICLES TO BREAK DOWN THE SAID OVERSIZE AGGREGATES INTO ULTIMATE PARTICLES AND SMALLER SIZE AGGREGATES, CONTINUING THE AGITATION UNTIL THE BODY OF PIGMENT PARTICLES HAS A MATERIALLY REDUCED CONTENT OF OVERSIZE AGGREGATES, ITS TINT TONE HAS BECOME BLUER, AND ITS TINTING STRENGTH HAS INCREASED MATERIALLY, AND THEN SEPARATING THE RESULTING PIGMENT MIXTURE FROM THE GRINDING PARTICLES, SEPARATING IT FROM THE INERT LIQUID, AND DRYING IT TO A PIGMENT POWDER.
Claim 2
Independent Claim
176 words
A METHOD OF IMPARTING BOTH A BLUER TINT TONE AND INCREASED TINTING STRENGTH TO A PARTICULATE TITANIUM DIOXIDE PIGMENT MIXTURE WHEREIN THE ULTIMATE PARTICLES ARE LESS THAN 0.4 MICRON IN DIAMETER BUT WHICH CONTAINS SUBSTANTIAL AMOUNTS OF OVERSIZE AGGREGATES IN THE SIZE RANGE OF FROM 0.4 TO 4 MICRONS AND IS SUBSTANTIALLY FREE FROM PARTICLES LARGER THAN ABOUT 4 MICRONS WHICH COMPRISES PREPARING A SLURRY IN AN INERT LIQUID OF SAID PIGMENT MIXTURE TOGETHER WITH ABOUT 2 TO 20 TIMES ITS WEIGHT OF INERT GRINDING PARTICLES HAVING AN AVERAGE SIZE OF ABOUT 10 TO 40 MESH, SUBJECTING THE SLURRY TO MECHANICAL AGITATION AND THEREBY CAUSING THE GRINDING PARTICLES TO BREAK DOWN THE SAID OVERSIZE AGGREGATES INTO ULTIMATE PARTICLES AND SMALLER SIZE AGGREGATES, CONTINUING THE AGITATION UNTIL THE BODY OF PIGMENT PARTICLES HAS A MATERIALLY REDUCED CONTENT OF OVERSIZE AGGREGATES, ITS TINT TONE HAS BECOME BLUER, AND ITS TINTING STRENGTH HAS INCREASED MATERIALLY, AND THEN SEPARATING THE RESULTING PIGMENT MIXTURE FROM THE GRINDING PARTICLES, SEPARATING IT FROM THE INERT LIQUID, AND DRYING IT TO A PIGMENT POWDER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |